Cable grip



Patented May 27, 1930 UNT STATES PHILIP J'. MARTIN, OF ELIZABETH, NEW JERSEY CABLE GRIP Application led July 2, 1929. Serial No. 375,567.

The invent-ion relates to improvements in woven cable grips. These grips are well known in the art and consist of a plurality of strands of wire or wire cord which are diagonally woven or interlaced to form an open mesh capable of contracting radially when extended lengthwise and of expanding radially when contracted lengthwise.

The present invention relates particularly to the draft heads or lugs for cable grips of this character and the means for attaching the cable grip to the draft heads.

The object of the invention is to provide a draft head or lug which is of extreme simplicity and economical to manufacture.

A further obj ect is to provide a draft head and means for attaching a cable grip thereto which permits of the utmost flexibility and allows the stresses and strains developed when the cable grip is in operation to be evenly distributed over all the wires or strands of the grip.

Further objects and advantages will become apparent as this specification proceeds.

Referring to the drawings forming a part thereof:

Fig. 1 is a side elevation of a pulling grip, the intermediate part of the grip being broken away for economy of space;

Fig. 2 is a view on a larger scale looking at right angles to Fig. 1, most of the cable grip being broken away.

Referring again to the drawings, the reference numeral 10 designates the woven open mesh cable grip. Grips of this general type being well known it is not thought necessary to enter int-o a detail description at this time. The grip is formed of a plurality of diagonally interwoven strands of wire or wire cord 11 which are formed into an open mesh hollow body, cylindrically shaped. The gripping action of this grip is due to the change of form of the meshes. When a pull is exerted, the meshes are elongated axially and are narrowed circumferentially, thus decreasing the diameter of the grip and causing it to firmly grasp the cable.

The strands 11 at the draft end of the cable grip are separated into a pair of freely formed loops 12 and 13. These loops are formed at approximately right angles to each other and the loop 12 is preferably somewhat shorter than the loop 13. The loops are freely formed in that they are not served or wound thus allowing the stresses and strains;55 set up when the grip is in operation to be evenly distributed to all the wires or strands of the grip.

The head or lug 14 comprises an eye portion 15 to which the draw rope is attachedtco and a shank or hub 16. The shank 16 has two apertures 17 and 18 spaced apartl longitudinally and having their lateral projections at approximately right angles to each other. These apertures or openings have their edges rounded off or countersunk as indicated at 19.

The loop or tug12 passes freely through the aperture A17 and the loop or tug 13 passes freely through the aperture 18, thus allowing the loops to slide freely through the apertures. This construction preventsany possibility of the cable grip pulling away from the head or lug and Vpermits of great fiexibility between the head and the grip. This is particularly useful in pulling a cable through uneven ducts or around bends in ducts. l

In Fig. 1 the head or lug is shown in broken lines in a position it might assume in pulling a cable around a bend. y With the usual type of cable grip in which the mesh is firmly secured to the head or one in which the neck and eye portions are served or wound, a great strain would have to be stood by the cable grip in this position and such strains soon result in the-cable grip wearing out. With the Villustrated construction this strain is eliminated. v f

In ,order `to provide a strong rug ed lug or head the portion above the shan 16 is 90 broadened out. The edges of the eye portion as indicated Vat 20 in Fig. 2 flare toward this broadened out portion and are so designed as to eliminate all projections that might come vin 'contact 'with any obstruction in the` 95 duct while the cable is being pulled through. As illustrated the pulling head is formed of a simple integral casting. The freely formed loops are passed through the apertures during the weaving of the cable grip.` 10

However, if desired, themeshes with their loops might be manufactured separately and the heads made of more than one piece so as to permit of the assembly of the heads and the grips.

Such changes in detail as would occur to one skilled in the art might be made without departing from the spirit of the invention or the scope of the appended claims.

I claim:

l. A cable grip formed of a tubular woven mesh of wire strands brought together at the draft end into a plurality of freely formed loops and a draft head provided with a plu,- rality of apertures through which said loops freely pass.

2. A cable grip formed of a tubular woven mesh of wire strands brought together at the draft end into a pair of freely formed loops and a draft head provided with a pair of apertures through which said loops freely ass. p 3. A cable grip having diagonally interwoven strands separated at one end into a pair of freely formed loops and a draft head provided with a pair of apertures spaced apart longitudinally and having their lateral projections at approximately right angles to each other through which said loops freelyV loops, and a draft head, said draft head having an eye portion and a shank portion, the shank portion being provided with a plur-ality of apertures extending therethrough saidapertures being spaced apart longitudinally and formed at approximately ri ht angles to the longitudinal axis of the ca le gri-p and said loops freely passing through said apertures.

6. A draft head for a cable grip, said cable Y grip being formed of a tubular woven mesh of wire strands, the draft head having Yan eye portion and a shank portion, the shank portion being provided with a plurality of apertures extending therethrough said apertures being spaced apart longitudinally and formed at approximately right angles tothe longitudinal axis of `the` draft head.

In testimony whereof I affix my signature.

PHILIP J.V MARTIN. 

